mirror of
https://github.com/Llewellynvdm/Tomb.git
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be911b1e16
this new "flavor" of tomb uses veracrypt for mounted volumes and POSIX sh only for its scripting, is a work in progress and still lacks full functionality, but provides a proof-of-concept to be developed further if needs arise.
403 lines
9.5 KiB
Bash
Executable File
403 lines
9.5 KiB
Bash
Executable File
#!/bin/sh
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#
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# Tomb v3, the Crypto Undertaker portable version 3
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#
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# A commandline tool to easily operate encryption of secret data
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#
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# {{{ License
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# Copyright (C) 2007-2022 Dyne.org Foundation
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#
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# Tomb is designed, written and maintained by Denis Roio <jaromil@dyne.org>
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#
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# Please refer to the AUTHORS file for more information.
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#
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# This source code is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This source code is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please refer
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# to the GNU Public License for more details.
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#
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# You should have received a copy of the GNU Public License along with
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# this source code; if not, , see <https://www.gnu.org/licenses/>.
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# }}} - License
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# {{{ Global variables
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VERSION="3.1.0"
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DATE="Nov/2022"
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TOMBEXEC="$0"
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TMPDIR="${TMP:-/tmp}"
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TOMBTMPFILES=""
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PATH="${PATH}:.:/usr/local/bin"
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exitcode=0
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# }}}
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# {{{ Logging functions
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_success() {
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echo "[*] " "$1" "$2" "$3" "$4" 1>&2
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}
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_message() {
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echo " . " "$1" "$2" "$3" "$4" 1>&2
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}
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_warning() {
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echo "[W] " "$1" "$2" "$3" "$4" 1>&2
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}
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_verbose() {
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echo "[D] " "$1" "$2" "$3" "$4" 1>&2
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}
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_error() {
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echo "[!] " "$1" "$2" "$3" "$4" 1>&2
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exitcode=1
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}
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_failure() {
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echo "[!!] " "$1" "$2" "$3" "$4" 1>&2
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exitcode=1
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exit 1
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}
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# }}}
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_success "Starting Tomb v$VERSION"
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# {{{ Internal functions
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_random_string() {
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len=${1:-32}
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[ "$1" != "" ] && {
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echo "print(O.random($len):base58())" | zenroom 2>/dev/null
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}
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return $?
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}
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_tmp_create() {
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[ -d "$TMPDIR" ] || {
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# we create the tempdir with the sticky bit on
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mkdir -m 1777 "$TMPDIR"
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[ $? = 0 ] || {
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_failure "Fatal error creating the temporary directory: %s" "$TMPDIR"
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}
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}
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tfile="${TMPDIR}/`_random_string 64`" # Temporary file
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umask 066
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[ $? = 0 ] || {
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_failure "Fatal error setting the permission umask for temporary files"
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}
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[ -r "$tfile" ] && {
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_failure "Someone is messing up with us trying to hijack temporary files."
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}
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touch "$tfile"
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[ $? = 0 ] || {
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_failure "Fatal error creating a temporary file: %s" "$tfile"
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}
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_verbose "Created tempfile: ::1 temp file::" "$tfile"
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TOMBTMP="$tfile"
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TOMBTMPFILES="$TOMBTMPFILES:$tfile"
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return 0
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}
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# }}}
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# {{{ FreeBSD
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freebsd_mount() {
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file="$1"
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mnt="$2"
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_verbose `veracrypt -l "$file"`
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loop=`veracrypt -l "$file" | awk '{print $3}'`
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_verbose "fsck $loop"
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fsck.ext4 -p -C0 "$loop"
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lklfuse -o type=ext4 "${loop}" "$mnt"
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return $?
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}
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freebsd_close() {
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file="$1"
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md=`veracrypt -l "$file" | awk '{print $3}'`
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# umount "$mnt"
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_verbose "md: $md"
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mnt=`pgrep -lf "lklfuse.*$md" | awk '{print $6}'`
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_verbose "mnt: $mnt"
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lkl=`pgrep -f "lklfuse.*$md" | awk '{print $1}'`
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_verbose "kill $lkl (lklfuse on $md)"
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# trying to deail with lklfuse bug
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# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239831
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renice -20 $lkl
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kill $lkl
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sync
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sleep 1
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kill -9 $lkl
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# lkl should have really exited now
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_verbose "veracrypt -d $file"
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veracrypt --text --non-interactive -d "$file"
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return $?
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}
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# }}}
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# {{{ Linux
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# usage: _mount /tmp/.veracrypt_ mountpoint
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linux_mount() {
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file="$1"
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mnt="$2"
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veralist=`veracrypt -l "$file" | awk '{print($2,":",$3,":",$4)}'`
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[ "$veralist" = "" ] && {
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_error "Cannot mount tomb not yet mapped " "$file"
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return 1
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}
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loop=`echo $veralist | cut -d: -f2 | xargs`
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[ "`echo $veralist | cut -d: -f3 | xargs`" != "-" ] && {
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_error "Tomb already mounted " "$file on $loop"
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return 1
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}
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_verbose "fsck $loop"
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fsck.ext4 -p -C0 "$loop" 1>&2
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_verbose "linux_mount $mnt"
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mount "$loop" "$mnt"
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return $?
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}
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# }}}
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# {{{ POSIX portable
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# usage: echo PASSWORD | posix_create file size pim
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posix_create() {
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file="$1" # must not exist
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size="$2" # veracrypt format (accepts M or G)
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pim="$3" # any number
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_verbose "posix_create $file $size $pim"
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veracrypt --text --non-interactive --stdin \
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-m nokernelcrypto \
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-c "$file" --volume-type normal \
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--hash sha512 --encryption serpent-aes \
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--filesystem none --size "$size" --pim "$pim" \
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--random-source /dev/urandom -k ''
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return $?
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}
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posix_format() {
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file="$1"
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loop=`veracrypt -l "$file" | awk '{print $3}'`
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_verbose "posix_format: ${loop}"
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mkfs.ext4 -L "`basename $file`" "$loop" # -E root_owner="${user_uid}:${user_gid}" "$loop"
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return $?
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}
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# usage: echo PASSWORD | posix_map file pim
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posix_map() {
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file="$1"
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pim="$2"
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_verbose "posix_map $file $pim"
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veracrypt --text --non-interactive --stdin \
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--protect-hidden no -m nokernelcrypto \
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-k '' --pim "$pim" --filesystem none \
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"$file"
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return $?
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}
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posix_close() {
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file="$1"
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_verbose "posix_close $file"
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veracrypt --text --non-interactive -d "$file"
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return $?
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}
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# }}}
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# {{{ Initialization
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system="unknown"
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create=""
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format=""
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map=""
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mount=""
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close=""
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tomb_init() {
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system="`uname -s`"
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case "$system" in
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FreeBSD)
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cat <<EOF
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create=posix_create
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format=posix_format
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map=posix_map
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mount=freebsd_mount
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close=freebsd_close
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EOF
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;;
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Linux)
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cat <<EOF
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create=posix_create
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format=posix_format
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map=posix_map
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mount=linux_mount
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close=posix_close
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EOF
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;;
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*)
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_failure "Unsupported system: %s" "$system"
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esac
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echo "system=$system"
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# _verbose "system detected: %s" $system
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}
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# }}}
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# {{{ Main
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[ "$1" = "source" ] && return 0
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eval "`tomb_init`"
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tombfile=""
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tombsize=""
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PIM=69
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cmd="$1"
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shift 1
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case "$cmd" in
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dig)
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args=2
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while [ $args -gt 0 ]; do
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[ "$1" = '-s' ] && { tombsize="$2"; shift 2; }
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[ "$1" != "" ] && { tombfile="$1"; shift 1; }
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args=$(( $args - 1 ))
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done
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[ "$tombfile" = "" ] && _failure "Missing path to tomb"
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[ "$tombsize" = "" ] && _failure "Size argument missing, use -s"
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# TODO: check if size is integer
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# [ "$tombsize" -ge 10 ] || _failure "Tombs can't be smaller than 10 mebibytes"
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[ -e "$tombfile" ] && {
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_error "A tomb exists already. I'm not digging here:"
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ls -l "$tombfile"; exit 1
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}
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_message "Commanded to dig tomb " "$tombfile" " sized $tombsize"
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touch "$tombfile" || _failure "Error creating the tomb " "$tombfile"
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# dd if=/dev/urandom bs=1048576 count=$tombsize of="$tombfile" || {
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# _failure "Error creating the tomb " "$tombfile"
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# exit 1
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# }
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if [ "$system" = "Linux" ]; then
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fallocate -x -l "$tombsize" "$tombfile" ||
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_failure "Error creating the tomb " "$tombfile"
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else
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bytesize="`tomb-str2size $tombsize`"
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[ "$bytesize" = "" ] && _failure "Error reading tomb size " "$tombsize"
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dd if=/dev/zero of="$tombfile" count="$(( bytesize / 1048576))" bs=1048576 ||
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_failure "Error creating the tomb " "$tombfile of $tombsize"
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fi
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;;
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forge)
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args=1
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[ "$1" = "" ] && _failure "Missing argument in command " "forge"
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while [ $args -gt 0 ]; do
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case "$1" in
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'-k') tombkey="$2"; shift 2 ;;
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*) tombkey="$1"; shift 1 ;;
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esac
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args=$(( $args - 1 ))
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done
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[ "$tombkey" = "" ] && _failure "Missing path to tomb key"
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[ -e "$tombkey" ] && {
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_error "A tomb key exists already. I'm not forging here:"
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ls -l "$tombkey"; exit 1
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}
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_message "Commanded to forge tomb key " "$tombkey"
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touch "$tombkey" || _failure "Error creating the tomb key " "$tombkey"
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cat <<EOF | zenroom -z | cut -d\" -f4 > "$tombkey"
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rule check version 2.0.0
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Given nothing
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When I create the random object of '64' bytes
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Then print the 'random object' as 'hex'
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EOF
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;;
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lock)
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args=2
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while [ $args -gt 0 ]; do
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case "$1" in
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'-k') tombkey="$2"; shift 2 ;;
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*) tombfile="$1"; shift 1 ;;
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esac
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args=$(( $args - 1 ))
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done
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case "$system" in
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Linux)
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tombsize=`stat "$tombfile" | awk '/Size:/ {print $2; exit}'`
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;;
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*)
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tombsize=`stat -f '%z' "$tombfile"`
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;;
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esac
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_message "Commanded to lock tomb " "$tombfile of $tombsize with key $tombkey"
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[ "$tombfile" = "" ] && _failure "Missing path to tomb"
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[ -r "$tombfile" ] || _failure "Tomb file not readable"
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[ "$tombkey" = "" ] && _failure "Missing path to key"
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[ -r "$tombkey" ] || _failure "Key file not readable"
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"$create" "$tombfile" "$tombsize" "$PIM" < "$tombkey" || {
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_failure "Error creating the tomb " "$tombfile"
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exit 1
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}
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"$map" "$tombfile" "$PIM" < "$tombkey" ||
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_failure "Error mapping the tomb " "$tombfile with key $tombkey"
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"$format" "$tombfile" ||
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_error "Error formatting tomb " "$tombfile"
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"$close" "$tombfile"
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[ $exitcode = 0 ] &&
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_success "Success locking tomb " "$tombfile with key $tombkey"
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;;
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open)
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args=3
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while [ $args -gt 0 ]; do
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case "$1" in
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'-k') tombkey="$2"; shift 2 ;;
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*) if [ "$tombfile" = "" ]; then
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tombfile="$1"
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else
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tombmount="$1"
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fi
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shift 1 ;;
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esac
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args=$(( $args - 1 ))
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done
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_message "Commanded to open tomb " "$tombfile with key $tombkey on $tombmount"
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[ "$tombfile" = "" ] && _failure "Missing path to tomb"
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[ -r "$tombfile" ] || _failure "Tomb file not readable"
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[ "$tombkey" = "" ] && _failure "Missing path to key"
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[ -r "$tombkey" ] || _failure "Key file not readable"
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[ "$tombmount" = "" ] && tombmount="`basename $tombfile`"
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"$map" "$tombfile" "$PIM" < "$tombkey"
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[ $? != 0 ] &&
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_failure "Error mapping the tomb " "$tombfile with key $tombkey"
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"$mount" "$tombfile" "$tombmount" || {
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"$close" "$tombfile"
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_failure "Error mounting the tomb " "$tombfile on $tombmount"
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}
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;;
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close)
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# args=1
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if [ "$1" = "all" ]; then
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"$close"
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elif [ -e "$1" ]; then
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"$close" "`realpath $1`" ||
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_failure "Error closing " "$1"
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elif [ "$1" = "" ]; then
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_failure "Missing argument: tomb file or mountpoint"
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else
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_failure "Wrong argument: $1"
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fi
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;;
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list)
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veracrypt -l
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;;
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esac
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# }}}
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exit 0
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